I have a used HTC PC36100. It's running Android version 2.3.5. I was only using it to play Spotify music because it had upgradable storage. I was having trouble installing applications through the Market. Every time I tried it, the phone would show "Starting Download..." and it would be stuck on it. I searched for a solution and there was something about clearing the Android Market app's data. That didn't work. I discovered that I could install apps through the Google Play Store on my computer. That worked for a while. But now, any time I try to install an app, the Google Play Store shows that it's installed, but it doesn't install on my phone. I tried a factory reset, and that hasn't helped. I also tried to install an app without an SD card installed, but that isn't working either. Uninstalling the Market's updates does nothing either. How do I fix this?